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The existence of toxic heavy metals in cigarette tobacco may thus introduce noticeable non-carcinogenic and carcinogenic health impacts accompanying inhalation exposure

It may come as a surprise, but marijuana smoke actually contains many of the exact same carcinogens as tobacco smoke, Agrawal says

Similar to secondhand smoke, thirdhand smoke contains nicotine, tar, heavy metals, and other harmful substances

USA TODAY reporter Ken Alltucker contributed.

The oral fixation and hand motion are real psychological factors

While chronic tobacco use and vaping before or after TBI can exacerbate injury, animal studies report that nicotine itself has shown neuroprotective effects by regulating nicotine receptors (nAChRs) and enhancing dopamine signaling